Hi Kelsey! I've stayed club-level at a few different resorts, and while the breakfast offerings vary somewhat from resort to resort, in general, you'll find bagels, croissants, muffins, pastries, fruit, yogurt, oatmeal, cereal, coffee, and juices. There's definitely enough food to fill you up, but if your family prefers a hot meal or lots of protein, like eggs and bacon, you may not find it substantial enough.
Hope this helps! Come visit us again at the Moms Panel if you have more questions!